Feature List

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ZeptoOS Compute Node Linux
Optimized kernel based on Linux 2.6.19 runs on the compute nodes of Blue Gene/P, with a slim ramdisk less than 1/3 of the size of the default I/O-node one.
ZeptoOS-enhanced I/O node Linux
Our I/O node kernel and ramdisk are based on the standard V1R3M0 release, but feature a number of ZeptoOS-specific improvements.
Run arbitrary processes on the compute nodes
Shell scripts, Java VM, unrestricted pthreads, etc.
Big Memory support
Zepto Compute Binaries run in Big Memory, a flat memory area covered by huge, semi-static TLB entries, resulting in a run-time performance comparable to that of a light-weight kernel.
Native communication support
The DMA driver, as well as standard BG/P communication libraries such as MPICH2 and the lower-level DCMF and SPI have been ported to the ZeptoOS Compute Node Linux, providing the applications with communication performance matching that of the light-weight kernel. Currently only the SMP mode is supported.
ZOID
ZeptoOS I/O Daemon performs job control and enables communication (remote file I/O, etc) between the compute nodes and the I/O nodes. ZOID can be easily extended through plug-ins to perform the forwarding of custom APIs.
Log into your I/O nodes
SSH daemon is enabled by default and is configured to allow the partition owner to log on the I/O nodes while the job is running.
Log into your compute nodes
Once logged on an I/O node, a user can open an interactive session to a compute node using telnet in order to, e.g., attach gdb to an application process running there. This is made possible using IP packet forwarding over the tree network, performed by ZOID.
PVFS support
Pre-built binaries of PVFS client code version 2.8.1, including the I/O node kernel module, are included in the ZeptoOS tarball for your convenience.
ALL source code
The ZeptoOS tarball includes all the source code: kernels, ramdisks, communication libraries, I/O forwarding, support libraries, tools and utilities, etc, along with all the support scripts and Makefiles needed to build binaries out of them. Pre-built binaries are also included for your convenience.
Safe to use alongside IBM CNK
Thanks to the way that Blue Gene machines are designed, ZeptoOS can easily and safely be used alongside the IBM CNK. Depending on the software configuration, the kernel to use can be specified on a per-partition, or even per-job, basis.

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